Malicious PDF — malware analysis report

Static analysis result for SHA-256 437d1f7013fa96be…

MALICIOUS

PDF

92.3 KB Created: 2021-07-29 20:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64d96fa6e6b58eca4508074b00b298d4 SHA-1: f73e3676f8a5865c39e72218c7b120e353303935 SHA-256: 437d1f7013fa96be9bbf3c036c547a49776c57e733b1d64ca1c352f0dfc6911d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress uploads. These links likely serve as lures to redirect users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ebbb8a1af---61479588197.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/aa27b760f68ac7244ca3712bdcc23e66/25242683346.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f38d3f78d9900ab22c804820d157b02f/dikojiriminuxuki.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/61945471054.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff9ec60ad8---towokosigasutifozi.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/bakunuwiwivemosufurevaxab.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6355cc5b4---kejetajexakitunanuj.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/zusanaladumobumajeze.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/146e303cb33fac6fd931bf4ab6006e1f/24545448747.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/tafefeji.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/jpjqvfidrnahu0tpbltetnnu5t/5062226052.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/a0pd3gmdmqtgn5dpptu7p3u3is/65017884431.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/3317055643.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/86235527030.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///32328109619.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210715223024.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/metasobuwane.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/51bc1c7a06cdc3375ca325b77b96b93e/zurozegixiriwokigizesota.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0643u64q5vet35uo4ga7htpj2t/kavuxamirubatuw.pdfIn PDF document text
    • http://samtekelektrik.com/files/49461609381.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/mqoqdah1fmpo8ha97e9bod1e30/64391657052.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086b110363ea---potomiradawogaguso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=%D0%B3%D0%B4%D0%B7+%D0%BF%D0%BE+%D0%B0%D0%BD%D0%B3%D0%BB%D0%B8%D0%B9%D1%81%D0%BA%D0%BE%D0%BC%D1%83+%D1%8F%D0%B7%D1%8B%D0%BA%D1%83+6+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D0%BA%D0%B0%D1%80%D0%BF%D1%8E%D0%BA+%D1%82%D0%B5%D1%82%D1%80%D0%B0%D0%B4%D1%8CPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 11612 bytes
SHA-256: 07f1e9e62f416fd853a9e95f9cba52bb399ffc559eec312cc2fcf76baf10bca3
font_01_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 23536 bytes
SHA-256: a22f75a76716b33807b85bdd08f7137285e131253d6cbbb209a0b4c40530e9eb

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